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I learned from this thread, effective resistance of an inductive load

A

Thread Starter

abstruse1

Joined Jan 18, 2021
6
...that the effective resistance of an inductive load running on AC isn't the same as its measured resistance with a DVM.

Is this true with DC also?
 
wayneh

wayneh

Joined Sep 9, 2010
17,152
abstruse1 said:
...that the effective resistance of an inductive load running on AC isn't the same as its measured resistance with a DVM.

Is this true with DC also?
Click to expand...
No. There’s no frequency-dependent component to pure DC. Note though that pulsing DC is not the same and would exhibit the impedance effect.
 
crutschow

crutschow

Joined Mar 14, 2008
27,172
The resistance component of a inductive load at line frequency is essentially the same as that measured by an ohmmeter, but the inductance adds a reactive impedance that is proportional to frequency.
 
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